Crossword Genius

Underground supporters (5)

Ross

I believe the answer is:

roots

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'underground supporters' is the definition.
Although both the answer and definition are plural nouns, I don't understand how they can define each other.

This is all the clue.

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(Other definitions for roots that I've seen before include "authentic music" , "To find ancestry" , "Cultural origins" , "Searches vigorously" , "Underground parts of plants" .)

I've seen this clue in the Evening Standard.
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